I had an item delivered to the Amazon Locker, but wasn’t able to pick it up as the user screen was showing a Linux console preboot prompt instead of the usual customer interface. That was midweek, same thing when I returned today (Sunday).
It was only moderately hard to get thru the customer help options to someone who understood the problem. So I get a refund, and reordered the item.
A couple years ago, when faced with a similar problem, I called the posted phone number while standing there, and it did eventually work as the person I reached was able to remotely reboot it. And then I put in my code and retrieved my purchase. But I didn’t feel like standing there that long, this time.